问题
计算题
化简3x2﹣[7x﹣5(4x﹣3)﹣2x2].
答案
解:3x2﹣[7x﹣5(4x﹣3)﹣2x2]
=3x2﹣[7x﹣20x+15﹣2x2]
=3x2﹣7x+20x﹣15+2x2
=5x2+14x﹣15
化简3x2﹣[7x﹣5(4x﹣3)﹣2x2].
解:3x2﹣[7x﹣5(4x﹣3)﹣2x2]
=3x2﹣[7x﹣20x+15﹣2x2]
=3x2﹣7x+20x﹣15+2x2
=5x2+14x﹣15